Infinite Reflection can enchant a creature controlled by another player.

5/1/2012

If Infinite Reflection enters the battlefield attached to a creature and then becomes attached to a different creature before its enters-the-battlefield trigger resolves, each other nontoken creature you control will become a copy of the first creature.

5/1/2012

If Infinite Reflection leaves the battlefield or becomes attached to a different creature, none of the copy effects end. Your creatures will still be copies of whatever creature each was a copy of.

5/1/2012

If Infinite Reflection enters the battlefield attached to a token creature, the nontoken creatures that become copies of that creature are not themselves tokens.

5/1/2012

Creatures you control don’t copy whether the enchanted creature is tapped or untapped, whether it has any counters on it, whether it has any Auras and Equipment attached to it, or any noncopy effects that have changed its power, toughness, types, color, or so on.

5/1/2012

Because creatures you control enter the battlefield as a copy of the enchanted creature, any enters-the-battlefield triggered abilities printed on such creatures won’t trigger. However, if the enchanted creature has any enters-the-battlefield triggered abilities, those will trigger.

5/1/2012

Replacement effects that modify how a permanent enters the battlefield are now applied in the following order: control-changing effects (such as Gather Specimens), then copy effects (such as the abilities of Infinite Reflection and Clone), then all other effects.

5/1/2012

If a creature such as Clone is entering the battlefield under your control, there will be two copy effects to apply: the creature’s own and Infinite Reflection’s. No matter what order these effects are applied, the creature will be a copy of the enchanted creature when it enters the battlefield.

5/1/2012

Other enters-the-battlefield replacement abilities printed on the creature entering the battlefield won’t be applied because the creature will already be a copy of the enchanted creature at that point (and therefore it won’t have those abilities). For example, if the enchanted creature is Serra Angel, a creature that normally enters the battlefield tapped will enter the battlefield as an untapped copy of Serra Angel, and a creature that would normally enter the battlefield with counters on it will enter the battlefield as a copy of Serra Angel with no counters.

5/1/2012

External abilities may still affect how a creature enters the battlefield. For example, if your opponent controls Urabrask the Hidden, which reads, in part, “Creatures your opponents control enter the battlefield tapped,” a creature entering the battlefield under your control will be a tapped copy of the enchanted creature.

5/1/2012

If you control more than one Infinite Reflection, you can apply those copy effects in any order. Creatures you control will enter the battlefield as a copy of the one whose copy effect you apply last.